My grandfather had a track builf approx 20 yrs ago. The track and trains have been sitting. I tried to use it agian today and I tried 3-4 loco's and they would all light up on the track and some would go approx 3-4 feet before they stop. I don't know if I should start trouble shooting with the locomotives or look at the transformer. Any suggestions would be great.....I would like to get it running for my child that is on the way. Any links to locomotive rebuilds would be great. I can fix thing I just have no idea where to start.